function::uint_arg - Linux

Overview

uint_arg is a command-line tool used to calculate the unsigned 32-bit integer argument of a function pointer. This argument is often required when invoking a function through a pointer in C programming.

Syntax

uint_arg <function pointer>

where <function pointer> is the address of the function to analyze.

Options/Flags

• -h, –help
  • Display a help message and exit.

Examples

Simple usage:

$ uint_arg 0x08048520
4294966304

Complex usage:

$ uint_arg `objdump -t main | grep '<main>' | cut -d ' ' -f 1`
4294967264

Common Issues

• Invalid function pointer: Ensure the provided function pointer is valid and points to a valid function in memory.
• Misaligned function pointer: The function pointer should be aligned to the size of the pointer on the target platform.

Integration

uint_arg can be combined with other commands to automate tasks:

# Print the function argument of the first function in an ELF file
objdump -t file.elf | grep '<main>' | cut -d ' ' -f 1 | uint_arg

Related Commands

• addr2line: Convert an address to a source file and line number.
• c++filt: Demangle C++ function names.